EFFECTS OF MICROWAVE EXCITATION ON SPECTRAL HOLE-BURNING IN COLOUR CENTRE SYSTEMS P.D. Bloch, W.S. Brocklesby, R.T. Harley and M.J. Henderson J. Phys. Colloques, 46 C7 (1985) C7-527-C7-530 DOI: 10.1051/jphyscol:1985794